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This paper presents an efficient conflict-free memory address scheme for arbitrary 2k-point memory-based FFT processors. The address scheme can support in-place strategy, continuous-flow mode, and variable size for arbitrary long sized FFT. More over, the address scheme can adjust the throughput by changing the computation radix and the parallelism of the arithmetic processing units according to the...
Long Term Evolution (LTE) is rapidly flourishing in the global market due to its speed, coverage, relative ease of deployment, and consistency. However, Quality of Service (QoS) provisioning scheme is not fully defined for LTE, and it is left open for researchers to explore. In this paper, we propose a QoS provisioning technique for LTE. This technique involves a two-level scheduling scheme, consisting...
Due to proliferation of mobile devices, the demand for video in cellular networks has increased exorbitantly. However, cellular networks have limited resources and the wireless medium is time-varying in nature. This necessitates the video streaming protocols to be re-designed taking into account the overall quality of experience (QoE) of the end users. In this paper, we propose a metric called enhanced-time...
Modern wireless communication systems adapt the employed Modulation and Coding Scheme (MCS) to the instantaneous channel quality in order to maximise the amount of bits correctly transmitted per time unit (i.e., the throughput). An important aspect in the study of this technique, referred to as Adaptive Modulation and Coding (AMC), is the characterisation of the link throughput performance under realistic...
The potential commercialization of the 5 GHz U-NII bands with unlicensed LTE technologies has sparked considerably debate throughout the wireless industry and beyond. This paper will look at the current state of investigations into the ability of unlicensed LTE technologies to coexist cooperatively with incumbent Wi-Fi implementations and discuss some of the implications involved.
Different standardization bodies are working towards test methodologies and procedures to determine true Multiple Impute Multiple Output (MIMO) performance. A reference CTIA (Cellular Telecommunications and Internet Association) 2×2 Long Term Evolution (LTE) MIMO antenna concept has been designed [1–2] and verified [3] to eliminate the uncertainties linked to the unknown antenna performance of the...
In this paper, we implement an application-aware scheduler that differentiates users running real-time applications and delay-tolerant applications while allocating resources. This approach ensures that the priority is given to real-time applications over delay-tolerant applications. In our system model, we include realistic channel effects of Long Term Evolution (LTE) system. Our application-aware...
We built up a Long Term Evolution (LTE) trial system operating in 5.8 GHz unlicensed bands and conducted a real time field trial in typical indoor environments. The user throughput of LTE with the 20MHz carrier in the unlicensed bands, which is used as a Supplemental Downlink (SDL) (always downlink), is evaluated and compared with that of Wireless Local Area Network (WLAN) with the same bandwidth...
Air traffic control radar, military air traffic surveillance radars, meteorological radars and mobile wireless communication operate in the S-band frequency range. Test and measurement of spectrum sharing methods and their co-existence is absolutely essential, as performance degradation of mobile devices, networks ans S-Band radars has been proven. This paper addresses potential issues, discusses...
The ever increasing number of mobile broadband users requires the availability of enhanced data services. Long Term Evolution or LTE is the evolution of High Speed Packet Access (HSPA), which was standardized by third generation partnership project (3GPP) Release 8 in order to meet the increasing demand of faster and more efficient mobile internet access today by supporting the larger bandwidth. This...
An uplink scheduler in the Long Term Evolution (LTE) network has the objective to improve the radio resources utilization in the network. The choice of uplink scheduling procedure used impacts the throughputs of individual users, as well as the overall throughput of the cell. This paper evaluates and compares the performance of three well-known LTE uplink schedulers (namely, Maximum Throughput (MT),...
Recent trends show that mobile users accessing the wireless communication network from public transportation vehicles such as the high speed train are on the increase. To serve on-board users effectively, the use of a two-hop communication link is a promising solution. However existing two-hop schemes are expensive technologies and not integral part of the cellular network. We focus on a two-hop integrated...
Appropriate bandwidth allocation is an important issue to benefit the long Term Evolution (LTE) networks performance. Single-carrier FDMA (SC-FDMA) multiple access scheme has been chosen for the 3GPP LTE uplink scheduling. However, it requires that all the sub carriers allocated to a single user must be in contiguous frequency band within each time slot. This constraint limits the scheduling flexibility...
In this paper we assess the benefit of WiFi offloading over dense urban scenarios in terms of both Quality of Service (QoS) and Electromagnetic Field (EMF) exposure. This study relies on results obtained with two complementary simulation platforms: a two-tier dynamic system-level simulator and a 3D coverage-based simulator. Outputs are usual service coverage key performance indicators, handover probability...
In this paper, we propose a distributed, self-organizing, adaptive and semi-static Soft Frequency Reuse based downlink Inter-Cell Interference Coordination scheme for an LTE system to increase the throughput of cell-edge users. Cells are able to self-organize the allocation of frequency sub-bands for cell-edge users using a distributed algorithm without requiring extensive pre-planning needed for...
As a breakthrough technology under 3GPP, LTE has attracted attention worldwide. Main features include enhanced peak data rates, lower delay, increased cell edge throughput. For an LTE system, serving a large number of users requires an efficient RRA algorithm which has not been standardized for the system and is still an open end for development. Researchers have proposed various algorithms some of...
With an increasing use of Long-Term Evolution (LTE) in mobile networks, it is necessary to evaluate its performance. In this paper, we evaluate the performance of Long Term Evolution (LTE) for mobile networks under Transmission Control Protocol (TCP) traffic. We evaluate the performance of LTE for TCP traffic for both the directions uplink as well as downlink. During the evaluations, we focus on the...
Long Term Evolution (LTE) packet scheduler is a key mechanism in the LTE traffic handling. It is mainly in charge of allocating physical resource blocks for the attached UEs. The main problem in LTE scheduler is to maximize the throughput while maintaining the fairness. The performance of scheduler is very critical, especially when many UEs are located at the cell edge. The new proposed scheduler...
Constant video surveillance of remote locations in rural areas, dense urbanized dwellings and strategic military sites is of paramount interest to law enforcing agencies. Aerial monitoring is now made possible by using dozens of camera mounted UAVs (Unmanned Aerial Vehicles) streaming video from different vantage points to a single command and control center. In this paper, we present an architecture...
The scheduling in LTE downlink channel is a key problem currently. The goal of many existing LTE scheduler is achieving the system highest performance, but the system fairness and delay of partial real-time service under limited bandwidth resources are not enough to be ensured sometimes. Therefore we design a multi-factor scheduling algorithm for the mixed business scenarios. Different from other...
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